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lxdream.org :: lxdream/src/sh4/sh4trans.c
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4trans.c
changeset 600:3b0f94d0faed
prev596:dfc0c93d882e
next617:476a717a54f3
author nkeynes
date Tue Jan 22 10:10:46 2008 +0000 (14 years ago)
permissions -rw-r--r--
last change Return immediately from xlat_get_code_by_vma if the icache is hit
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     1 /**
     2  * $Id$
     3  * 
     4  * SH4 translation core module. This part handles the non-target-specific
     5  * section of the translation.
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    19 #include <assert.h>
    20 #include <setjmp.h>
    21 #include "eventq.h"
    22 #include "syscall.h"
    23 #include "clock.h"
    24 #include "sh4/sh4core.h"
    25 #include "sh4/sh4trans.h"
    26 #include "sh4/xltcache.h"
    29 static jmp_buf xlat_jmp_buf;
    30 static gboolean xlat_running = FALSE;
    32 gboolean sh4_xlat_is_running()
    33 {
    34     return xlat_running;
    35 }
    37 /**
    38  * Execute a timeslice using translated code only (ie translate/execute loop)
    39  */
    40 uint32_t sh4_xlat_run_slice( uint32_t nanosecs ) 
    41 {
    42     sh4r.slice_cycle = 0;
    44     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
    45 	if( sh4r.event_pending < nanosecs ) {
    46 	    sh4r.sh4_state = SH4_STATE_RUNNING;
    47 	    sh4r.slice_cycle = sh4r.event_pending;
    48 	}
    49     }
    51     switch( setjmp(xlat_jmp_buf) ) {
    52     case XLAT_EXIT_BREAKPOINT:
    53 	sh4_clear_breakpoint( sh4r.pc, BREAK_ONESHOT );
    54 	/* fallthrough */
    55     case XLAT_EXIT_HALT:
    56 	if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
    57 	    TMU_run_slice( sh4r.slice_cycle );
    58 	    SCIF_run_slice( sh4r.slice_cycle );
    59 	    dreamcast_stop();
    60 	    return sh4r.slice_cycle;
    61 	}
    62     case XLAT_EXIT_SYSRESET:
    63 	dreamcast_reset();
    64 	break;
    65     }
    67     xlat_running = TRUE;
    68     void * (*code)() = NULL;
    69     while( sh4r.slice_cycle < nanosecs ) {
    70 	if( sh4r.event_pending <= sh4r.slice_cycle ) {
    71 	    if( sh4r.event_types & PENDING_EVENT ) {
    72 		event_execute();
    73 	    }
    74 	    /* Eventq execute may (quite likely) deliver an immediate IRQ */
    75 	    if( sh4r.event_types & PENDING_IRQ ) {
    76 		sh4_accept_interrupt();
    77 		code = NULL;
    78 	    }
    79 	}
    81 	if( code == NULL ) {
    82 	    if( sh4r.pc > 0xFFFFFF00 ) {
    83 		syscall_invoke( sh4r.pc );
    84 		sh4r.in_delay_slot = 0;
    85 		sh4r.pc = sh4r.pr;
    86 	    }
    88 	    code = xlat_get_code_by_vma( sh4r.pc );
    89 	    if( code == NULL ) {
    90 		code = sh4_translate_basic_block( sh4r.pc );
    91 	    }
    92 	}
    93 	uint32_t oldpc = sh4r.pc;
    94 	code = code();
    95     }
    97     xlat_running = FALSE;
    98     sh4_starting = FALSE;
   100     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
   101 	TMU_run_slice( nanosecs );
   102 	SCIF_run_slice( nanosecs );
   103     }
   104     return nanosecs;
   105 }
   107 uint8_t *xlat_output;
   108 xlat_cache_block_t xlat_current_block;
   109 struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
   110 uint32_t xlat_recovery_posn;
   112 void sh4_translate_add_recovery( uint32_t icount )
   113 {
   114     xlat_recovery[xlat_recovery_posn].xlat_offset = 
   115 	((uintptr_t)xlat_output) - ((uintptr_t)xlat_current_block->code);
   116     xlat_recovery[xlat_recovery_posn].sh4_icount = icount;
   117     xlat_recovery_posn++;
   118 }
   120 /**
   121  * Translate a linear basic block, ie all instructions from the start address
   122  * (inclusive) until the next branch/jump instruction or the end of the page
   123  * is reached.
   124  * @return the address of the translated block
   125  * eg due to lack of buffer space.
   126  */
   127 void * sh4_translate_basic_block( sh4addr_t start )
   128 {
   129     sh4addr_t pc = start;
   130     sh4addr_t lastpc = (pc&0xFFFFF000)+0x1000;
   131     int done, i;
   132     xlat_current_block = xlat_start_block( start );
   133     xlat_output = (uint8_t *)xlat_current_block->code;
   134     xlat_recovery_posn = 0;
   135     uint8_t *eob = xlat_output + xlat_current_block->size;
   137     if( GET_ICACHE_END() < lastpc ) {
   138 	lastpc = GET_ICACHE_END();
   139     }
   141     sh4_translate_begin_block(pc);
   143     do {
   144 	/* check for breakpoints at this pc */
   145 	for( i=0; i<sh4_breakpoint_count; i++ ) {
   146 	    if( sh4_breakpoints[i].address == pc ) {
   147 		sh4_translate_emit_breakpoint(pc);
   148 		break;
   149 	    }
   150 	}
   151 	if( eob - xlat_output < MAX_INSTRUCTION_SIZE ) {
   152 	    uint8_t *oldstart = xlat_current_block->code;
   153 	    xlat_current_block = xlat_extend_block( xlat_output - oldstart + MAX_INSTRUCTION_SIZE );
   154 	    xlat_output = xlat_current_block->code + (xlat_output - oldstart);
   155 	    eob = xlat_current_block->code + xlat_current_block->size;
   156 	}
   157 	done = sh4_translate_instruction( pc ); 
   158 	assert( xlat_output <= eob );
   159 	pc += 2;
   160 	if ( pc >= lastpc ) {
   161 	    done = 2;
   162 	}
   163     } while( !done );
   164     pc += (done - 2);
   165     int epilogue_size = sh4_translate_end_block_size();
   166     uint32_t recovery_size = sizeof(struct xlat_recovery_record)*xlat_recovery_posn;
   167     uint32_t finalsize = xlat_output - xlat_current_block->code + epilogue_size + recovery_size;
   168     if( eob - xlat_output < finalsize ) {
   169 	uint8_t *oldstart = xlat_current_block->code;
   170 	xlat_current_block = xlat_extend_block( finalsize );
   171 	xlat_output = xlat_current_block->code + (xlat_output - oldstart);
   172     }	
   173     sh4_translate_end_block(pc);
   175     /* Write the recovery records onto the end of the code block */
   176     memcpy( xlat_output, xlat_recovery, recovery_size);
   177     xlat_current_block->recover_table_offset = xlat_output - (uint8_t *)xlat_current_block->code;
   178     xlat_current_block->recover_table_size = xlat_recovery_posn;
   179     xlat_commit_block( finalsize, pc-start );
   180     return xlat_current_block->code;
   181 }
   183 /**
   184  * "Execute" the supplied recovery record. Currently this only updates
   185  * sh4r.pc and sh4r.slice_cycle according to the currently executing
   186  * instruction. In future this may be more sophisticated (ie will
   187  * call into generated code).
   188  */
   189 void sh4_translate_run_recovery( xlat_recovery_record_t recovery )
   190 {
   191     sh4r.slice_cycle += (recovery->sh4_icount * sh4_cpu_period);
   192     sh4r.pc += (recovery->sh4_icount<<1);
   193 }
   195 void sh4_translate_unwind_stack( gboolean abort_after, unwind_thunk_t thunk )
   196 {
   197     void *pc = xlat_get_native_pc();
   199     assert( pc != NULL );
   200     void *code = xlat_get_code( sh4r.pc );
   201     xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
   202     if( recover != NULL ) {
   203 	// Can be null if there is no recovery necessary
   204 	sh4_translate_run_recovery(recover);
   205     }
   206     if( thunk != NULL ) {
   207 	thunk();
   208     }
   209     // finally longjmp back into sh4_xlat_run_slice
   210     xlat_running = FALSE;
   211     longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
   212 } 
   214 void sh4_translate_exit( int exit_code )
   215 {
   216     void *pc = xlat_get_native_pc();
   217     if( pc != NULL ) {
   218 	// could be null if we're not actually running inside the translator
   219 	void *code = xlat_get_code( sh4r.pc );
   220 	xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
   221 	if( recover != NULL ) {
   222 	    // Can be null if there is no recovery necessary
   223 	    sh4_translate_run_recovery(recover);
   224 	}
   225     }
   226     // finally longjmp back into sh4_xlat_run_slice
   227     xlat_running = FALSE;
   228     longjmp(xlat_jmp_buf, exit_code);
   229 }
   231 void sh4_translate_breakpoint_hit(uint32_t pc)
   232 {
   233     if( sh4_starting && sh4r.slice_cycle == 0 && pc == sh4r.pc ) {
   234 	return;
   235     }
   236     sh4_translate_exit( XLAT_EXIT_BREAKPOINT );
   237 }
   239 /**
   240  * Exit the current block at the end of the current instruction, flush the
   241  * translation cache (completely) and return control to sh4_xlat_run_slice.
   242  *
   243  * As a special case, if the current instruction is actually the last 
   244  * instruction in the block (ie it's in a delay slot), this function 
   245  * returns to allow normal completion of the translation block. Otherwise
   246  * this function never returns.
   247  *
   248  * Must only be invoked (indirectly) from within translated code.
   249  */
   250 void sh4_translate_flush_cache()
   251 {
   252     void *pc = xlat_get_native_pc();
   253     assert( pc != NULL );
   255     void *code = xlat_get_code( sh4r.pc );
   256     xlat_recovery_record_t recover = xlat_get_recovery(code, pc, TRUE);
   257     if( recover != NULL ) {
   258 	// Can be null if there is no recovery necessary
   259 	sh4_translate_run_recovery(recover);
   260 	xlat_flush_cache();
   261 	xlat_running = FALSE;
   262 	longjmp(xlat_jmp_buf, XLAT_EXIT_CONTINUE);
   263     } else {
   264 	xlat_flush_cache();
   265 	return;
   266     }
   267 }
   269 void *xlat_get_code_by_vma( sh4vma_t vma )
   270 {
   271     void *result = NULL;
   273     if( IS_IN_ICACHE(vma) ) {
   274 	return xlat_get_code( GET_ICACHE_PHYS(vma) );
   275     }
   277     if( vma > 0xFFFFFF00 ) {
   278 	// lxdream hook
   279 	return NULL;
   280     }
   282     if( !mmu_update_icache(vma) ) {
   283 	// fault - off to the fault handler
   284 	if( !mmu_update_icache(sh4r.pc) ) {
   285 	    // double fault - halt
   286 	    ERROR( "Double fault - halting" );
   287 	    dreamcast_stop();
   288 	    return NULL;
   289 	}
   290     }
   292     assert( IS_IN_ICACHE(sh4r.pc) );
   293     result = xlat_get_code( GET_ICACHE_PHYS(sh4r.pc) );
   294     return result;
   295 }
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